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# Copyright © 2008 Raphaël Hertzog <hertzog@debian.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
package Dpkg::Compression::Compressor;
use strict;
use warnings;
use Dpkg::Compression;
use Dpkg::Gettext;
use Dpkg::IPC;
use Dpkg::ErrorHandling;
use POSIX;
our $default_compression = "gzip";
our $default_compression_level = 9;
# Class methods
sub set_default_compression {
my ($self, $method) = @_;
error(_g("%s is not a supported compression"), $method)
unless compression_is_supported($method);
$default_compression = $method;
}
sub set_default_compression_level {
my ($self, $level) = @_;
error(_g("%s is not a compression level"), $level)
unless $level =~ /^([1-9]|fast|best)$/;
$default_compression_level = $level;
}
# Object methods
sub new {
my ($this, %args) = @_;
my $class = ref($this) || $this;
my $self = {};
bless $self, $class;
$self->set_compression($args{"compression"} || $default_compression);
$self->set_compression_level($args{"compression_level"} ||
$default_compression_level);
return $self;
}
sub set_compression {
my ($self, $method) = @_;
error(_g("%s is not a supported compression method"), $method)
unless compression_is_supported($method);
$self->{"compression"} = $method;
}
sub set_compression_level {
my ($self, $level) = @_;
error(_g("%s is not a compression level"), $level)
unless $level =~ /^([1-9]|fast|best)$/;
$self->{"compression_level"} = $level;
}
sub get_compress_cmdline {
my ($self) = @_;
my @prog = (compression_get_property($self->{"compression"}, "comp_prog"));
my $level = "-" . $self->{"compression_level"};
$level = "--" . $self->{"compression_level"}
if $self->{"compression_level"} =~ m/best|fast/;
push @prog, $level;
return @prog;
}
sub get_uncompress_cmdline {
my ($self) = @_;
return (compression_get_property($self->{"compression"}, "decomp_prog"));
}
sub _sanity_check {
my ($self, %opts) = @_;
# Check for proper cleaning before new start
error(_g("Dpkg::Compression::Compressor can only start one subprocess at a time"))
if $self->{"pid"};
# Check options
my $to = my $from = 0;
foreach (qw(file handle string pipe)) {
$to++ if $opts{"to_$_"};
$from++ if $opts{"from_$_"};
}
internerr("exactly one to_* parameter is needed") if $to != 1;
internerr("exactly one from_* parameter is needed") if $from != 1;
return %opts;
}
sub compress {
my $self = shift;
my %opts = $self->_sanity_check(@_);
my @prog = $self->get_compress_cmdline();
$opts{"exec"} = \@prog;
$self->{"cmdline"} = "@prog";
$self->{"pid"} = fork_and_exec(%opts);
delete $self->{"pid"} if $opts{"to_string"}; # wait_child already done
}
sub uncompress {
my $self = shift;
my %opts = $self->_sanity_check(@_);
my @prog = $self->get_uncompress_cmdline();
$opts{"exec"} = \@prog;
$self->{"cmdline"} = "@prog";
$self->{"pid"} = fork_and_exec(%opts);
delete $self->{"pid"} if $opts{"to_string"}; # wait_child already done
}
sub wait_end_process {
my ($self, %opts) = @_;
$opts{"cmdline"} ||= $self->{"cmdline"};
wait_child($self->{"pid"}, %opts) if $self->{'pid'};
delete $self->{"pid"};
delete $self->{"cmdline"};
}
1;
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